dialing tone

n.

（电话的）拨号音；局内回答信号；

Tone dialing activated emergency locator signal light system
The TDA1077 - An I/sup 2/L circuit for two-tone telephone dialing
An Integrated RC Oscillator for TOUCH-TONE® Dialing
Tone Dialing Generator with Processor Microchip
Tone-selective waystation dialing system interconnecting ¿message¿ and regular telephone line
A microcircuit tone generator for push-button dialing
Tone Dialing
Design of Low Power Dissipation of Dual-Tone Multi-Frequency(DTMF) Voice Password Dialing
Dialing confirmation tone output apparatus
Tone dialing activated emergency locator signal light system